_base_ = ['./base.py']
item = dict(a = {{ _base_.item1 }}, b = {{ _base_.item2.item3 }})

"""
>>> cfg = Config.fromfile('./config_g.py')
>>> cfg.pretty_text
"item1 = 'a'\nitem2 = dict(item3='b')\nitem = dict(a='a', b='b')\n"
>>> print(cfg.pretty_text)
item1 = 'a'
item2 = dict(item3='b')
item = dict(a='a', b='b')
"""